Methods and compositions for selectively dissolving...

E - Fixed Constructions – 21 – B

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E21B 43/27 (2006.01) C09K 8/74 (2006.01)

Patent

CA 2691871

In a method of treating a sandstone-containing subterranean formation penetrated by a wellbore, a slurry of a carrier fluid containing a surface modification agent of at least one of a hydro lyzable organosilicon compound, a phosphonate compound or a combination of these is formed. The slurry is introduced into the wellbore at or above the fracture pressure of the formation. A sandstone-dissolving material is introduced into the wellbore with or subsequent to introduction of the slurry. The surface modification agent may be encapsulated within an encapsulating material. A composition for use in treating sandstone-containing subterranean formations is also provided. The composition includes an aqueous carrier fluid containing an encapsulated surface modification agent of at least one of a hydro lysable organosilicon compound and a phosphonate compound that is encapsulated within an encapsulating material.

L'invention concerne un procédé de traitement d'une formation souterraine contenant du grès dans laquelle est formé un puits de forage. Ce procédé consiste à former une bouillie de liquide porteur contenant un agent de modification de surface constitué d'au moins un composé d'organosilicium hydrolysable, d'un composé phosphonate ou d'une combinaison des deux. La bouillie obtenue est introduite dans le puits de forage à la pression de fracturation de la formation ou au-dessus de ladite pression. Un matériau de dissolution de grès est introduit dans le puits de forage en même temps que la bouillie ou après l'introduction de celle-ci. L'agent de modification de surface peut être encapsulé dans un matériau d'encapsulation. L'invention concerne également une composition servant à traiter des formations souterraines contenant du grès. Cette composition comprend un liquide porteur aqueux contenant un agent de modification de surface encapsulé constitué d'au moins un composé d'organosilicium hydrolysable ou d'un composé phosphonate encapsulé dans un matériau d'encapsulation.

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